The diagram shows the leg muscles of an athlete leaving the starting blocks for a race. Which muscles contract and which relax to bring about the change from position 1…

In water, the Fe^2+ ion bonds with water to form Fe(H2O)6^2+. In haemoglobin in the blood, five of the water molecules have been displaced. In the presence of air, the…

Nuclide P decays by emission of ionising radiation to produce nuclide Q. This new nuclide then decays by further emission into nuclide R. The process is shown below, with the…

Which blood vessel will have capillaries at both ends? Answer: 21) D The Hepatic portal vein is the only blood vessel which carries nutrient rich blood from one organ to…

Which one of the following is not a measure of electrical power? (V = potential difference, I = current, Q = charge, t = time, R = resistance) Answer: 20)…

The diagram shows three sperm and three ova containing sex chromosomes X and Y (notdrawn to scale). Indicate the letters (A to F) of all the sex cells which are…

The general formula for the alkane series of hydrocarbons is CnH2n+2 The primary amine series has the same saturated structure as the alkanes, but also contains an –NH2 group. What…

A parachutist of total mass 90kg (including the parachute) is falling at a terminal velocity of 6m/s. Take the force due to gravity on a mass of 1kg to be…